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This question tests your ability to distinguish benzodiazepines from other psychotropic drugs. Benzodiazepines act on the GABA-A receptor as positive allosteric modulators, enhancing inhibitory neurotransmission and producing sedation, anxiolysis, anticonvulsant effects, and muscle relaxation. Midazolam, Lorazepam, and Diazepam all belong to this class and share that mechanism, which is why they’re used for sedation, anxiety relief, and seizures. Haloperidol, on the other hand, is not a benzodiazepine; it’s a typical antipsychotic that mainly blocks dopamine D2 receptors, addressing psychosis and agitation through a different pharmacologic pathway. So the drug that is not a benzodiazepine is Haloperidol.